Handling Historical Ca II K Spectroheliogram Observation

Sami K Solanki1, Theodosios Chatzistergos2, Ilaria Ermolli3 and Natalie Krivova1, (1)Max Planck Institute for Solar System Research, Göttingen, Germany, (2)INAF Osservatorio Astronomico di Roma, Rome, Italy, (3)Istituto Nazionale di Astrofisica Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
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